The attorney leading the NFL players’ union investigation into the Ray Rice domestic violence case told The Associated Press the league and the Baltimore Ravens have not been cooperating.

Richard Craig Smith told the AP on Friday night that the NFL has not provided documents and witnesses requested by the NFLPA’s investigators, while the Ravens have refused any cooperation with similar requests.

“I am interested in the facts, and if we get cooperation from all the parties that were involved, we will have an understanding of what happened,” Smith said. “We cannot accept public statements that call for transparency, candor and openness and then not allow the investigators to do their jobs.”

The union’s investigation, like a similar probe organized by the NFL, isn’t a law enforcement inquiry and the parties involved aren’t under any legal obligation to comply with requests. The league and the union, however, have each said separately that they wanted answers in the case.

The players’ union hired Smith, a former federal prosecutor, one month ago to oversee its investigation into how the Ravens and the league handled themselves during the events that led to the suspension, as well as how the team handled issues like due process. Separately, the NFL hired former FBI director Robert S. Mueller III to conduct a probe into how the league handled evidence as it investigated the claims against Rice. NFL owners plan to make the findings of Mueller’s report public.